This function can be broken up into four elements as follows:
=SERIES([Series Name],[X Values],[Y Values],[Plot Order])
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Data series usually refer to groups of data that are on Excel charts.
It would be a group of cells in Excel that have values in them. These can then be identified for use in creating charts in Excel. Different charts need data series for them to show.
Use =PERCENTILE(range,0.85) where range is the data that you want to analyse.
Surface Chart
If you want a single best fit to all the data you collected, what difference does it make whether you collected them all at the same time or in two different runs ? Why not just merge the two data series, and call them a single data set.